Multiple VideoAd Requests

I'm developing a game for iOS and Android and i have integrated Unity Ads
There are a few unclear things about Unity Ads that i hoped i can get the answers from the forum.

I'm using Unity 2018.3.0f2, should i use the built in ads? or the Monetization SDK? what's the difference? (also i cant find the banner ads in the built in version)

is it okay to request multiple ad placements at a time before actually needing to show the ad? i have an example use case for this, when the game starts, i request two ad placements, video and rewardedVideo, if the player scores above half the best score and dies, they're shown a rewardedVideo (it's ready because its been requested before hand), and a video otherwise (ready because its ready before hand)

is it okay to request multiple ad placements at a time before actually needing to show the ad? i have an example use case for this, when the game starts, i request two ad placements, video and rewardedVideo, if the player scores above half the best score and dies, they're shown a rewardedVideo (it's ready because its been requested before hand), and a video otherwise (ready because its ready before hand)

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We don't currently have an API to request a video. Requests happen automatically during initialization and once an ad starts playing, the next one is requested. So that's not a step you have to worry about.

The Ads SDK will request the ad assets to fill as many placements as possible. We do not need to distinguish between a rewarded and non-rewarded placement at the request. The overlay is typically the only thing that changes between a rewarded video and a non-rewarded video.

Oops...

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